child domain access failure

Hi,

I've a Windows 2000 domain controller and recently, i've configured a child
domain (windows server 2003) to point to the Windows 2000 domain controller.
Now I have a problem.

All the windows 2k pro clients cannot access the child domain(win2k3). It
pops up the message : 'Logon Failure: Account currently disabled'. The
strange thing is, all the WinXP Pro can access to it.

What should i do to enable all accounts to access the child domain? I've
tried adding the Win2k domain users groups to the Win2k3 child domain, but
not working. Please help.

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Regards,
Tan Lee Yew,
Software Development Department,
MS Elevators Engineering Sdn Bhd,
Kuchai Lama, KL, Malaysia.